Artificial tooth



F. CARLING.

ARTIFICIAL TOOTH. APPLICATION FlLE D 0012s, 1920.

1,391,651 Pai zentedSept. 20, 1921.

Y wfihes's'es. i 3 yE/VTOR per 4 MM T oR/VEY UNITED STATES, PATENT OFFICE- FRANCIS GARLING, or BELFAST, IRELAND.

- v ARTIFICIAL 'roo'rn.

Specification of Letters Patent. Patented Se t Application filed October as, 1920. Serial No. 420,253.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3. 1921, 41 STAT. L., 1313.)

To all whom it may concern:

Be it known that'I, FRANoIsGARLINe, a subject of the King of Great Britain and Ireland, residing at Belfast, Ireland, have invented certain new and useful Improvements in Artificial Teeth, (for which I filed an application in Great Britain, Oct. 29, 1915, which is now patent of July'QO, 1916, No. 15,272,) of which the following is a specification.

This invention relates to artificial teeth and its object is to provide improvements therein. 7

My invention consists in providing an improved tooth of the class having a rearward projection or buttress and a single securing pin, the tooth in accordance with my inven tion being characterized by the projection or buttress. tapering rearwardly from the neck of the tooth and also from the cutting edge to a central portion, fiat at the rear, and in which the single securing pin is embedded and at each side of which is an undercut cavity. This construction makes for lincreased strength and also for natural appearance of the tooth.

In order that the invention may be clearly understood 1 have hereunto appended explanatory drawings showinga tooth made in accordance with my invention.

Figure 1 is a rear view of the tooth.

Fig. 2 is a side View and Fig. 3 is ,a sectional plan view on the line 3 3, Fig. 1.

The artificial tooth'a, shown on the drawings, is made with a solid rearward projection or buttress having a flat central portion a which has anundercut' cavity a on each side, and a single securing pin 6 projecting rearwardly therefrom. The buttress tapers rcarwardly from the neck of the tooth, as shown at a Fig. 2 and also from the cutting edge, as shown at a Fig. 2 to the flat central portion a When the tooth is on its plate, the buttress and pin willbe embedded in the vulcanite, or equivalent, of the plate, so that the undercut cavities will be filled with the vulcanite, or equivalent, and the tooth 0!. thereby effectively secured against movement or displacement.

The improved tooth, as above described, is

very strong, and the. undercut cavities (11?, on

each side of the portion a of the buttress give it an exceedingly firm lateral grip in the vulcanite, in addition to the usual securing effect of the pin Z). The tooth a combines the advantages of the all porcelain diatoric, and

the costly two pin tooth, and it has not the objectionable weakness of the former, nor

tie excessive cost of the latter, with its two expens ve pins. The improved tooth is more natural in type than the flat backed pin tooth and it is very much stronger in every way.

It is also much stronger'than the diatoric type of tooth as, unlike the latter, it has no hole running through the buttress but depends on' the grip of the vulcanite in the undercut cavities and the securing effect of the'pro ecting pin for its retention on the plate. 7

iHaving now fully described my invention what- I claim' and desire tosecure by Letters Patent is An artificial tooth having a solid rearward prejection which tapers rearwardly from the neck and cutting edge of the tooth to a flat central portion and has an undercut cavity at each side of the projection, and a securing pin secured in said projection.

- In testimony whereof I afliX my signature in presence of two witnesses.

FRANCIS GARLING.

WVitnesses ANDRU HAMILTON, DELLA THOMPSON; 

